Today's Message Index:
----------------------
1. 09:41 AM - Re: Fuel Pressure (DaveG601XL)
2. 01:05 PM - alternator (BobbyPaulk@comcast.net)
3. 01:51 PM - Re: alternator (Rob Turk)
4. 06:32 PM - Re: Re: Fuel Pressure (FLYaDIVE)
Message 1
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| Subject: | Re: Fuel Pressure |
Bobby,
For what it's worth, my fuel pressure varies from 1.5 to 3.5 PSIA on my Dynon EMS
charts. This includes both electric pump on and off. There is a lot of variation,
likely from the 40 psi transducer trying to read in the extreme low of
its range. My low fuel pressure limit is set at 1.5 PSIA so it rarely chirps.
I would think that a sudden step change is something to look into, but if
my limit was set at 1.8 PSIA, the alarm would be going off all the time.
Dave
--------
David Gallagher
Zodiac 601 XL-B: flying, 280+ hours now
Next project under construction: Finish my father's Aircamper
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441231#441231
Message 2
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List,
I have two flights of about 30 minutes each on my Jabiru 3300 after some repairs
and a couple of modifications.
I changed the Alternator coils from 2 parallel circuits to 1 series circuit in
accordance with Jabiru AVDALSR-087-1. It was working fine on the first flight
and most of the second flight. Output was 14.6 volts while taxiing out. Halfway
thru the second flight I turned on strobe lights to put a load on the alternator.
I figure I was drawing no more than 11 amps. When I reduced power to enter
downwind I smelled wires burning and noticed the battery voltage was down to
12.2. I turned off the strobes and landed.
On inspection I found every other coil ( 6 ) in the alternator burned black and
the alternator no longer worked.
I am not going back with the original magnet / stator dynamo.
My question to the list is whether to go with the CAMit alternator or the Rotec.
I am leaning toward the CAMit version since they are very familiar with the
Jabiru / CAMit Engine.
Does anyone know if the belt on either one can be changed without removing the
aluminum back plate?
Bobby
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 236 hrs.
Do Not Archive
Message 3
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CAMit for sure. As you say, they know the engine very well (they built
them for many years) and today sell new engines with just this
alternator setup.
The aluminium spider needs to come off to change the belt, but that
should be easy with the old alternator parts removed, and only a
once-every-500-hours job.
Rob
On 4/24/2015 10:04 PM, BobbyPaulk@comcast.net wrote:
> List,
> I have two flights of about 30 minutes each on my Jabiru 3300 after
> some repairs and a couple of modifications.
> I changed the Alternator coils from 2 parallel circuits to 1 series
> circuit in accordance with Jabiru AVDALSR-087-1. It was working fine
> on the first flight and most of the second flight. Output was 14.6
> volts while taxiing out. Halfway thru the second flight I turned on
> strobe lights to put a load on the alternator. I figure I was drawing
> no more than 11 amps. When I reduced power to enter downwind I smelled
> wires burning and noticed the battery voltage was down to 12.2. I
> turned off the strobes and landed.
> On inspection I found every other coil ( 6 ) in the alternator burned
> black and the alternator no longer worked.
> I am not going back with the original magnet / stator dynamo.
> My question to the list is whether to go with the CAMit alternator or
> the Rotec. I am leaning toward the CAMit version since they are very
> familiar with the Jabiru / CAMit Engine.
> Does anyone know if the belt on either one can be changed without
> removing the aluminum back plate?
>
> Bobby
> Zodiac 601 XL "B"
> Jabiru 3300 S/N 1141
> Sensenich 64" x 51" Prop
> Bing Carb 260 Main & 290 Needle Jet
> Status - Flying 236 hrs.
>
> Do Not Archive
> *
>
>
> *
Message 4
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| Subject: | Re: Fuel Pressure |
Are you sure it is PSIA?
Pressures you would read would be in PSIG!
So if you are really reading PSIA you are way too low... About 13.2 PSI
low.
Barry
On Fri, Apr 24, 2015 at 12:41 PM, DaveG601XL <david.m.gallagher@ge.com>
wrote:
> david.m.gallagher@ge.com>
>
> Bobby,
>
> For what it's worth, my fuel pressure varies from 1.5 to 3.5 PSIA on my
> Dynon EMS charts. This includes both electric pump on and off. There is a
> lot of variation, likely from the 40 psi transducer trying to read in the
> extreme low of its range. My low fuel pressure limit is set at 1.5 PSIA
> so it rarely chirps. I would think that a sudden step change is something
> to look into, but if my limit was set at 1.8 PSIA, the alarm would be going
> off all the time.
>
> Dave
>
> --------
> David Gallagher
> Zodiac 601 XL-B: flying, 280+ hours now
> Next project under construction: Finish my father's Aircamper
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=441231#441231
>
>
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